Method and apparatus for line coding

ABSTRACT

The present invention provides a convolutional line coding method, including: constructing a sequence set, where the length of each sequence in the sequence set is n bits; selecting a balanced sequence in the sequence set, and obtaining source data of n−1 bits corresponding to the balanced sequence; performing Hamming distance detection for an unbalanced sequence in the sequence set to obtain source data of n−1 bits corresponding to the unbalanced sequence; sorting the balanced sequence and the unbalanced sequence according to an operation difference value, and generating a code table, where the source data of n−1 bits correspond to the sequence of n bits, and the code table is designed for line coding; and at time of encoding the source data of n−1 bits, obtaining a coding result of n bits according to a mapping relation in the code table.

CROSS-REFERENCE TO RELATED APPLICATION

This application is a continuation of International Application No. PCT/CN2009/071900, filed on May 21, 2009, which is hereby incorporated by reference in its entirety.

FIELD OF THE INVENTION

The present invention relates to communication technologies, and in particular, to a method and an apparatus for line coding.

BACKGROUND

Line coding is widely applied in the Ethernet system. Line coding is designed to enable the point-to-point system to use cost-effective optical receiver. Due to Direct Current (DC) balance and the small number of DC components of line coding, the line coding is more suitable for the Ethernet Passive Optical Network (EPON) system. Common line coding modes include: 9B10B line coding, 8B10B line coding, 64B/66B line coding, and 64B/65B line coding. The 8B10B coding efficiency is not high, and involves 20% redundancy. Neither the 64B/66B line coding nor the 64B/65B line coding solves the DC balance or ensures few DC components. Therefore, the 9B10B line coding is a relatively better coding manner.

In the current 9B10B line coding, each control character corresponds to a 9-bit source, and namely, there are 18 9-bit sources, where each 9-bit source corresponds to a 10-bit codeword and a 10-bit control character. For example, after “0 1010 1010” is encoded, the value “01 0101 0100” is a 10-bit codeword, and the value “01 0101 0101” is a control character. If the last bit is erroneous due to channel noise, the receiver is unable to decode the bits correctly, and the performance is deteriorated. Therefore, a new 9B10B line coding mode is required.

SUMMARY

A convolutional line coding method is provided in an embodiment of the present invention.

The method includes:

constructing a sequence set, where the length of each sequence in the sequence set is n bits, and n is a natural number greater than 1;

selecting a balanced sequence in the sequence set, and obtaining source data of n−1 bits corresponding to the balanced sequence;

performing Hamming distance detection for the unbalanced sequence in the sequence set to obtain source data of n−1 bits corresponding to the unbalanced sequence; and

sorting the balanced sequence and the unbalanced sequence according to an operation difference value, and generating a code table, where the source data of n−1 bits correspond to the sequence of n bits, and the code table is designed for line coding; and at time of encoding the source data of n−1 bits, obtaining a coding result of n bits according to a mapping relation in the code table.

Meanwhile, a convolutional line coder is provided herein. The coder includes:

a sequence set obtaining module, configured to construct a sequence set, where the length of each sequence is n bits;

a relation associating module, configured to: select a balanced sequence in the sequence set, and obtain source data of n−1 bits corresponding to the balanced sequence; perform Hamming distance detection for the unbalanced sequence in the sequence set to obtain source data of n−1 bits corresponding to the unbalanced sequence; and

a coding module, configured to: sort the balanced sequence and the unbalanced sequence according to the operation difference value, and generating a code table, where the source data of n−1 bits correspond to the sequence of n bits; at the time of encoding the source data of n−1 bits, obtain the coding result of n bits according to the mapping relation in the code table.

Further, a coding method provided in an embodiment of the present invention includes:

performing 9B10B line coding for every 9-bit source data according to a current operation difference value of line coding, where the line coding is implemented by searching a code table.

The coding method provided herein obtains the source data of n−1 bits corresponding to the unbalanced sequence through Hamming distance detection, restricts the number of continuous 0s or 1s, and makes the amplitude limitable and controllable. The source data of n−1 bits correspond to the sequence of n bits uniquely, thus improving the coding performance.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a flowchart of a method according to an embodiment of the present invention;

FIG. 2 is a state graph, corresponding to a 3-state lattice graph designed, according to an embodiment of the present invention; and

FIG. 3 shows a structure of a convolutional line coder according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE EMBODIMENTS

The technical solution under the present invention is expounded below with reference to accompanying drawings. Evidently, the embodiments given herein are for the exemplary purpose only, and are not the entirety of the embodiments of the present invention. Those skilled in the art can derive other embodiments from the embodiments given herein without making any creative effort, and all such embodiments are covered in the protection scope of the present invention.

A new convolutional line coding method provided herein is suitable especially for optical communication. The code rate is R=(n−1)/n, and is suitable for state convolutional coders and Viterbi decoders.

As shown in FIG. 1, a convolutional line coding method includes the following steps:

S101: Construct a sequence set, where the length of each sequence in the sequence set is n bits.

n is a natural number greater than 1. This set includes balanced sequences and unbalanced sequences. All codewords in this set comply with w(α)≦W≦n, where α is any sequence of n bits in the set, w(α) is an operation difference value of α, and w is a constant which is an even number. A balanced sequence refers to a sequence in which the number of 0s is equal to the number of 1s; and an unbalanced sequence refers to a sequence in which the number of 0s is unequal to the number of 1s. Alternatively, a balanced sequence refers to the sequence whose operation difference value is 0, and an unbalanced sequence refers to the sequence whose operation difference value is not 0.

The operation difference value herein is defined as: the operation difference value of a j-bit binary sequence s is the difference between the number of 0s and the number of is in the j-bit sequence s, namely,

${R\; D\; {S_{j}(s)}} = {\sum\limits_{i = {- \infty}}^{j}{s_{i}.}}$

S_(i) is a bit unit in the sequence s, and its value range is {−1, +1}. That is, before the operation difference value is calculated, the value range {0, 1} of S_(i) needs to be mapped to {−1,+1}.

S102: Select a balanced sequence in the sequence set, and obtain source data of n−1 bits corresponding to the balanced sequence.

In practice, the first or last bit in the balanced sequence may be deleted to obtain the source data of n−1 bits corresponding to the balanced sequence.

S103: Perform Hamming distance detection for the unbalanced sequence in the sequence set to obtain source data of n−1 bits corresponding to the unbalanced sequence.

When the Hamming distance reaches its minimum value, the source data of n−1 bits corresponding to the unbalanced sequence is obtained.

S104: Sort the balanced sequence and the unbalanced sequence according to the operation difference value, and generate a code table corresponding to the source data of n−1 bits and the sequence of n bits. This code table is designed for line coding. At the time of encoding the source data of n−1 bits, a coding result of n bits is obtained according to the mapping relation in the code table.

The line coding method provided herein involves low redundancy, and is applicable to line coding of optical communication systems. It ensures a specific amount of 0 and 1 transients of code streams, and is conducive to clock recovery of the receiver of the optical transmission system. The coding method provided herein obtains the source data of n−1 bits corresponding to the unbalanced sequence through Hamming distance detection, restricts the number of continuous 0s or 1s, and makes the amplitude limitable and controllable. The source data of n−1 bits correspond to the sequence of n bits uniquely, thus improving the coding performance.

Further, a W+1 state lattice graph is designed. Each lattice graph corresponds to a 2^(n−1) n−bit sequence set. That is, a corresponding (n−1) BnB code table is created for each w+1 state. Alternatively, the (n−1) BnB code tables corresponding to all operation difference values obtained in S104 may be aggregated into a total (n−1) BnB code table. The balanced sequence has only one corresponding (n−1) B source datum, and two unbalanced sequences correspond to one (n−1) B source datum. The two unbalanced sequences may be in a complementing relation or not.

Taking n=10 as an example, the 9B10B line coding method is described below.

In this embodiment, W is set to 4, and then a w(α)≦4 10-bit sequence set is constructed. By setting W to 4, this embodiment decreases the maximum amplitude of the designed codeword.

First, a 10-bit sequence set is constructed. In this embodiment, the sequence set includes the following 10-bit sequences: all 10-bit balanced sequences, a sequence of six 1s and four 0s, a sequence of six 0s and four 1s, a sequence of seven 1s and three 0s, and a sequence of seven 0s and three 1s. In practice, a total of 912 10-bit sequences meet the foregoing conditions, and only 512 10-bit sequences corresponding to the 9-bit source data are required as 10-bit codewords. Therefore, the codewords with many continuous 0s or is may be further removed. For example, the 10-bit codewords which have 4 or more bits of the same value at the beginning or have 5 or more bits of the same value at the end may be deleted.

Afterward, all 10-bit balanced sequences in the 10-bit sequence set are selected, namely, five 1s and five 0s. The first bit of each 10-bit balanced sequence is deleted to obtain 9 bits, which are 9-bit source data corresponding to the 10-bit codeword. Alternatively, the last bit of each 10-bit balanced sequence is deleted to obtain 9 bits, which are 9-bit source data corresponding to the 10-bit codeword.

Perform Hamming distance detection for the unbalanced sequence in the 10-bit sequence set to obtain the 9-bit source data corresponding to the unbalanced sequence. A mapping relation is set up according to the principle that a minimum Hamming distance exists between the 9-bit source data and the 10-bit codeword.

Afterward, the sequences are sorted according to the operation difference value (or sorted in W+1 states) to generate the 9B10B code table corresponding to each operation difference value. Because W is set to 4, the obtained 9B10B codeword has five different operation difference values: −4, −2, 0, 2, and 4. The code table whose operation difference value is 0 is composed of 240 DC-balance 10-bit codewords; the code table whose operation difference value is ±2 is composed of 190 10-bit codewords, and each codeword includes six 1s (or 0s) and four 0s (or 1s); the code table whose operation difference value is ±4 is composed of 82 10-bit codewords, and each codeword includes seven 1s (or 0s) and three 0s (or 1s). In practice, the code table obtained above may be searched in the coding. Given below are exemplary code tables.

TABLE 1 9B 10B Operation difference value is −4 000011001 1000010001 000011010 1000010010 000011100 1000010100 000101001 1000001001 000101100 1000001100 000110001 1000100001 000110010 1000100010 000110100 1000100100 000111000 1000011000 000111110 1000110000 001001001 0001001001 001001010 0001001010 001001100 0001001100 001010001 0001010001 001010010 0001010010 001010100 0001010100 001011000 0001011000 001100001 0001100001 001100010 0001100010 001100100 0001100100 001101000 1001001000 001110000 0001101000 010001001 0010001001 010001010 0010001010 010001100 0010001100 010010001 0010010001 010010010 0010010010 010010100 0010010100 010011000 0010011000 010100001 0010100001 010100010 0010100010 010100100 0010100100 010101000 1010001000 010110000 0010101000 011000001 0011000001 011000010 0011000010 011000100 0011000100 011001000 0011001000 011010000 1010010000 011100000 0010110000 011111001 1001000001 011111010 1000001010 100001001 0100001001 100001100 0100001100 100010001 0100010001 100010010 0100010010 100010100 0100010100 100011000 0100011000 100100001 0100100001 100100010 0100100010 100100100 0100100100 100101000 1000101000 100110000 0100101000 101000001 0101000001 101000010 0101000010 101000100 0101000100 101001000 0101001000 101010000 1001010000 101100000 0001110000 101110110 0001000110 101111010 1001000010 101111100 1001000100 110000001 1100000001 110000010 1100000010 110000100 1100000100 110001000 1100001000 110010000 1100010000 110100000 0100110000 110110110 1000000110 110111001 1010000001 110111010 1010000010 110111100 1010000100 111000000 0011010000 111000001 0110000001 111000010 0110000010 111000100 0110000100 111001000 0110001000 111010000 0101010000 111010110 0010000110 111011010 0100001010 111100000 0110010000 111100110 0100000110 Operation difference value is −2 000000000 1001010001 000000001 1010100001 000000010 1001100010 000000011 1010100010 000000100 1010010100 000000101 1010100100 000000110 0101000110 000000111 0110000110 000001000 1001011000 000001001 1101001000 000001010 1001001010 000001011 1010001010 000001100 1100001100 000001101 1000001101 000001110 1000001110 000010000 1010011000 000010001 1100010001 000010010 1100010010 000010011 1000010011 000010100 1100010100 000010101 1000010101 000010110 1000010110 000011000 1100011000 000011111 1000011001 000100000 1001100100 000100001 1100100001 000100010 1100100010 000100011 1000100011 000100100 1100100100 000100101 1000100101 000100110 1000100110 000101000 1100101000 000101010 1000101010 000101111 1000101100 000110000 1010110000 000110111 1000110100 000111011 1000111000 000111101 1000101001 000111111 1000011100 001000000 1001101000 001000001 1101000001 001000010 1101000010 001000011 1001000011 001000100 1101000100 001000101 1001000101 001000110 1001000110 001001000 0100000111 001010000 1011010000 001011111 0001010011 001100000 0001000111 001101111 0001101100 001110111 0001110100 001111011 0001111000 001111101 0001100011 001111110 0001101001 001111111 0001010110 010000000 1010101000 010000001 1011000001 010000010 1011000010 010000011 1010000011 010000100 1011000100 010000101 1010000101 010000110 1010000110 010001000 1000000111 010010000 1000001011 010011111 0010001011 010100000 0010000111 010101111 0010101100 010110111 0010110100 010111011 0010111000 010111101 0010100011 010111110 0010100101 010111111 0010110001 011000000 0001001011 011001111 0011001100 011010111 0011010100 011011011 0011011000 011011101 0011000011 011011110 0010011001 011011111 0010010110 011100111 0011100100 011101011 0011101000 011101101 0001010101 011101110 0010101001 011101111 1011001000 011110011 0011100010 011110101 0010010101 011110110 0011000101 011110111 0010100110 011111011 0010101010 011111100 0011001001 011111101 0011100001 011111110 0010110010 011111111 1010010001 100000000 1001110000 100000001 1110000001 100000010 1110000010 100000011 1100000011 100000100 1110000100 100000101 1100000101 100000110 1100000110 100001000 1110001000 100001010 1100001010 100010000 1101010000 100011111 0100011100 100100000 1100110000 100101111 0100101100 100110111 0100110100 100111011 0100111000 100111101 0100100011 100111110 0100100101 100111111 1000110010 101000000 0100001011 101001111 0101001100 101010111 0101010100 101011011 0101011000 101011101 0101000011 101011110 0001011001 101011111 0001011010 101100111 0101100100 101101011 0101101000 101101101 0001001101 101101110 0101001001 101101111 0001001110 101110011 0101100010 101110101 0001100101 101110111 0001100110 101111001 1001001001 101111011 0001101010 101111101 0101010001 101111110 0001110010 101111111 1001100001 110000000 1110010000 110001111 0110001100 110010111 0110010100 110011011 0110010010 110011101 0110000011 110011110 0100011001 110011111 0010011010 110100111 0110100100 110101011 0110001010 110101101 0010001101 110101110 0100101001 110101111 0010001110 110110011 0110100010 110110101 0100010101 110110111 0100100110 110111011 0100101010 110111101 0100110001 110111110 0100110010 110111111 1000011010 111000111 0111000100 111001011 0111000010 111001101 0100001101 111001110 0110001001 111001111 0100001110 111010011 0010010011 111010101 0101000101 111010111 0100010110 111011001 1010001001 111011011 0100011010 111011100 0110011000 111011101 0110010001 111011110 0001011100 111011111 1001001100 111100011 0100010011 111100101 0110000101 111100111 0011000110 111101001 1100001001 111101010 0110101000 111101011 0011001010 111101100 0111001000 111101101 0101100001 111101110 0101001010 111101111 1010001100 111110001 0011110000 111110010 0101110000 111110011 0011010001 111110100 0110110000 111110101 0110100001 111110110 0011010010 111110111 1001010010 111111000 0111010000 111111001 0111000001 111111010 0101010010 111111011 1010010010 111111100 0010011100 111111101 0001110001 111111110 1001010100 111111111 1000110001 Operation difference value is 0 000001111 1000001111 000010111 1000010111 000011011 1000011011 000011101 1000011101 000011110 1000011110 000100111 1000100111 000101011 1000101011 000101101 1000101101 000101110 1000101110 000110011 1000110011 000110101 1000110101 000110110 1000110110 000111001 1000111001 000111010 1000111010 000111100 1000111100 001000111 1001000111 001001011 1001001011 001001101 1001001101 001001110 1001001110 001001111 0001001111 001010011 1001010011 001010101 1001010101 001010110 1001010110 001010111 0001010111 001011001 1001011001 001011010 1001011010 001011011 0001011011 001011100 1001011100 001011101 0001011101 001011110 0001011110 001100011 1001100011 001100101 1001100101 001100110 1001100110 001100111 0001100111 001101001 1001101001 001101010 1001101010 001101011 0001101011 001101100 1001101100 001101101 0001101101 001101110 0001101110 001110001 1001110001 001110010 1001110010 001110011 0001110011 001110100 1001110100 001110101 0001110101 001110110 0001110110 001111000 1001111000 001111001 0001111001 001111010 0001111010 001111100 0001111100 010000111 1010000111 010001011 1010001011 010001101 1010001101 010001110 1010001110 010001111 0010001111 010010011 1010010011 010010101 1010010101 010010110 1010010110 010010111 0010010111 010011001 1010011001 010011010 1010011010 010011011 0010011011 010011100 1010011100 010011101 0010011101 010011110 0010011110 010100011 1010100011 010100101 1010100101 010100110 1010100110 010100111 0010100111 010101001 1010101001 010101010 1010101010 010101011 0010101011 010101100 1010101100 010101101 0010101101 010101110 0010101110 010110001 1010110001 010110010 1010110010 010110011 0010110011 010110100 1010110100 010110101 0010110101 010110110 0010110110 010111000 1010111000 010111001 0010111001 010111010 0010111010 010111100 0010111100 011000011 1011000011 011000101 1011000101 011000110 1011000110 011000111 0011000111 011001001 1011001001 011001010 1011001010 011001011 0011001011 011001100 1011001100 011001101 0011001101 011001110 0011001110 011010001 1011010001 011010010 1011010010 011010011 0011010011 011010100 1011010100 011010101 0011010101 011010110 0011010110 011011000 1011011000 011011001 0011011001 011011010 0011011010 011011100 0011011100 011100001 1011100001 011100010 1011100010 011100011 0011100011 011100100 1011100100 011100101 0011100101 011100110 0011100110 011101000 1011101000 011101001 0011101001 011101010 0011101010 011101100 0011101100 011110000 1011110000 011110001 0011110001 011110010 0011110010 011110100 0011110100 011111000 0011111000 100000111 1100000111 100001011 1100001011 100001101 1100001101 100001110 1100001110 100001111 0100001111 100010011 1100010011 100010101 1100010101 100010110 1100010110 100010111 0100010111 100011001 1100011001 100011010 1100011010 100011011 0100011011 100011100 1100011100 100011101 0100011101 100011110 0100011110 100100011 1100100011 100100101 1100100101 100100110 1100100110 100100111 0100100111 100101001 1100101001 100101010 1100101010 100101011 0100101011 100101100 1100101100 100101101 0100101101 100101110 0100101110 100110001 1100110001 100110010 1100110010 100110011 0100110011 100110100 1100110100 100110101 0100110101 100110110 0100110110 100111000 1100111000 100111001 0100111001 100111010 0100111010 100111100 0100111100 101000011 1101000011 101000101 1101000101 101000110 1101000110 101000111 0101000111 101001001 1101001001 101001010 1101001010 101001011 0101001011 101001100 1101001100 101001101 0101001101 101001110 0101001110 101010001 1101010001 101010010 1101010010 101010011 0101010011 101010100 1101010100 101010101 0101010101 101010110 0101010110 101011000 1101011000 101011001 0101011001 101011010 0101011010 101011100 0101011100 101100001 1101100001 101100010 1101100010 101100011 0101100011 101100100 1101100100 101100101 0101100101 101100110 0101100110 101101000 1101101000 101101001 0101101001 101101010 0101101010 101101100 0101101100 101110000 1101110000 101110001 0101110001 101110010 0101110010 101110100 0101110100 101111000 0101111000 110000011 1110000011 110000101 1110000101 110000110 1110000110 110000111 0110000111 110001001 1110001001 110001010 1110001010 110001011 0110001011 110001100 1110001100 110001101 0110001101 110001110 0110001110 110010001 1110010001 110010010 1110010010 110010011 0110010011 110010100 1110010100 110010101 0110010101 110010110 0110010110 110011000 1110011000 110011001 0110011001 110011010 0110011010 110011100 0110011100 110100001 1110100001 110100010 1110100010 110100011 0110100011 110100100 1110100100 110100101 0110100101 110100110 0110100110 110101000 1110101000 110101001 0110101001 110101010 0110101010 110101100 0110101100 110110000 1110110000 110110001 0110110001 110110010 0110110010 110110100 0110110100 110111000 0110111000 111000011 0111000011 111000101 0111000101 111000110 0111000110 111001001 0111001001 111001010 0111001010 111001100 0111001100 111010001 0111010001 111010010 0111010010 111010100 0111010100 111011000 0111011000 111100001 0111100001 111100010 0111100010 111100100 0111100100 111101000 0111101000 111110000 0111110000 Operation difference value is 2 000000111 1010100111 000001010 1001001111 000001011 1101001011 000001100 1010001111 000001101 1101001101 000001110 1100001111 000010010 1001011011 000010011 1110010011 000010100 1001010111 000010101 1110010101 000010110 1100010111 000011000 1010011011 000011001 1100011101 000011010 1001011110 000011100 1010011110 000011111 1100011110 000100011 1010110011 000100101 1010110101 000100110 1100100111 000101000 1010101011 000101001 1100101101 000101010 1100101011 000101100 1100101110 000101111 1000101111 000110001 1100111001 000110010 1100110011 000110100 1100110101 000110111 1000110111 000111000 1100111010 000111011 1000111011 000111101 1000111101 000111110 1000111110 001000010 1001101011 001000011 1101010011 001000100 1001100111 001000101 1101100101 001000110 1101000111 001001000 1001101101 001001001 1001111001 001001010 1001101110 001001100 1101001110 001010000 1001110011 001010001 1101011001 001010010 1101011010 001010100 1101010110 001011000 1101011100 001011111 1001011101 001100000 1001110101 001100001 1101101001 001100010 1001111010 001100100 1001110110 001101000 1101101010 001101111 0001101111 001110000 1001111100 001110111 0001110111 001111011 0001111011 001111101 0001111101 001111110 0001111110 010000010 1011001011 010000011 1011100011 010000100 1010010111 010000101 1011100101 010000110 1011000111 010001000 1011001101 010001001 1010111001 010001010 1010101110 010001100 1011001110 010010000 1011010011 010010001 1011011001 010010010 1011011010 010010100 1011010110 010011000 1011011100 010011111 1010011101 010100000 1010101101 010100001 1011101001 010100010 1010111010 010100100 1010110110 010101000 1011101010 010101111 0010101111 010110000 1010111100 010110111 0010110111 010111011 0010111011 010111101 0010111101 010111110 0010111110 011000000 1011010101 011000001 1011110001 011000010 1011110010 011000100 1011100110 011001000 1011101100 011001111 0011001111 011010000 1011110100 011010111 0011010111 011011011 0011011011 011011101 0011011101 011011110 0011011110 011100000 1011111000 011100111 0011100111 011101011 0011101011 011101101 0011101101 011101110 0011101110 011110011 0011110011 011110101 0011110101 011110110 0011110110 011111001 0011111001 011111010 0011111010 011111100 0011111100 100000011 1101100011 100000101 1110100101 100000110 1110000111 100001001 1110001101 100001010 1110001011 100001100 1110001110 100010001 1110011001 100010010 1110011010 100010100 1110010110 100011000 1110011100 100011111 1100011011 100100001 1110101001 100100010 1110100011 100100100 1100110110 100101000 1110101010 100101111 0100101111 100110000 1100111100 100110111 0100110111 100111011 0100111011 100111101 0100111101 100111110 0100111110 101000000 1101010101 101000001 1101110001 101000010 1101110010 101000100 1101100110 101001000 1101101100 101001111 0101001111 101010000 1101110100 101010111 0101010111 101011011 0101011011 101011101 0101011101 101011110 0101011110 101100000 1101111000 101100111 0101100111 101101011 0101101011 101101101 0101101101 101101110 0101101110 101110011 0101110011 101110101 0101110101 101110110 0101110110 101111001 0101111001 101111010 0101111010 101111100 0101111100 110000001 1110110001 110000010 1110110010 110000100 1110100110 110001000 1110101100 110001111 0110001111 110010000 1110110100 110010111 0110010111 110011011 0110011011 110011101 0110011101 110011110 0110011110 110100000 1110111000 110100111 0110100111 110101011 0110101011 110101101 0110101101 110101110 0110101110 110110011 0110110011 110110101 0110110101 110110110 0110110110 110111001 0110111001 110111010 0110111010 110111100 0110111100 111000000 0111101010 111000001 0111110001 111000010 0111110010 111000100 0111011100 111000111 0111000111 111001000 0111101100 111001011 0111001011 111001101 0111001101 111001110 0111001110 111010000 0111110100 111010011 0111010011 111010101 0111010101 111010110 0111010110 111011001 0111011001 111011010 0111011010 111100000 0111111000 111100011 0111100011 111100101 0111100101 111100110 0111100110 111101001 0111101001 Operation difference value is 4 000000000 1010110111 000000001 1100111011 000000010 1101011011 000000011 1110110011 000000100 1101100111 000000101 1011110101 000000110 1011110110 000001000 1011101011 000001001 1110101101 000010000 1110011011 000010001 1101110101 000100000 1011110011 000100001 1110110101 000100010 1011111010 000100100 1101110110 000110000 1011111100 000111111 1100111110 001000000 1001111101 001000001 1101111001 001111111 1001111110 010000000 1011011101 010000001 1011111001 010111111 1010111101 011011111 1011011110 011101111 1011101101 011110111 0011110111 011111011 0011111011 011111101 0011111101 011111110 1011101110 011111111 1011010111 100000000 1101110011 100000001 1110111001 100000010 1110101110 100000100 1110110110 100001000 1101111010 100010000 1110111010 100100000 1101111100 100111111 1100111101 101011111 1101011101 101101111 1101101011 101110111 0101110111 101111011 0101111011 101111101 0101111101 101111110 1101011110 101111111 1101010111 110000000 1110111100 110011111 1110011101 110101111 1110100111 110110111 0110110111 110111011 0110111011 110111101 0110111101 110111110 1010111110 110111111 1100110111 111001111 1110001111 111010111 0111010111 111011011 0111011011 111011100 0111011110 111011101 0111011101 111011110 1110011110 111011111 1110010111 111100111 0111100111 111101010 0111101011 111101011 1110101011 111101100 0111101110 111101101 1101101101 111101110 1101101110 111101111 1101001111 111110001 0111111001 111110010 0111111010 111110011 0111110011 111110100 0111110110 111110101 0111101101 111110110 0011111110 111110111 1011100111 111111000 0111111100 111111001 0111110101 111111010 0101111110 111111011 1001111011 111111100 0110111110 111111101 1010111011 111111110 1011011011 111111111 1001110111

Further, a lattice graph of W+1=5 states is designed, and the five states correspond to −4, −2, 0, 2, and 4. In this embodiment, n is set to 10. In order to reduce complexity, a 3-state lattice graph is designed additionally. FIG. 2 is a state graph, corresponding to a 3-state lattice graph designed, according to an embodiment of the present invention. Each lattice graph corresponds to 512 10-bit sequence sets, namely, a corresponding 9B10B code table is created for each state. The solution under the present invention has three states: −2, 0, and +2. In this case, the operation difference still has five values: −4, −2, 0, 2, and 4.

The 9B10B code table corresponding to the state “−2” may be a combination of the code tables sorted according to the operation difference value: 240 balanced codes plus 190 unbalanced codes whose operation difference value is +2 plus 82 unbalanced codes whose operation difference value is +4.

The 9B10B code table corresponding to the state “0” may be a combination of the code tables sorted according to the operation difference value: 240 balanced codes plus the first 136 codewords of the unbalanced code table whose operation difference value is +2 plus the first 136 codewords of the unbalanced code table whose operation difference value is −2.

The 9B10B code table corresponding to the state “+2” may be a combination of the code tables sorted according to the operation difference value: 240 balanced codes plus 190 unbalanced codes whose operation difference value is −2 plus 82 unbalanced codes whose operation difference value is −4.

The overall code table is as follows:

TABLE 2 Code table 9B 10B Operation 10B Operation (decimal) Binary Decimal difference value Binary Decimal difference value 0 1010110111 695 4 1001010001 593 −2 1 1100111011 827 4 1010100001 673 −2 2 1101011011 859 4 1001100010 610 −2 3 1110110011 947 4 1010100010 674 −2 4 1101100111 871 4 1010010100 660 −2 5 1011110101 757 4 1010100100 676 −2 6 1011110110 758 4 0101000110 326 −2 7 1010100111 679 2 0110000110 390 −2 8 1011101011 747 4 1001011000 600 −2 9 1110101101 941 4 1101001000 840 −2 10 1001001111 591 2 1001001010 586 −2 11 1101001011 843 2 1010001010 650 −2 12 1010001111 655 2 1100001100 780 −2 13 1101001101 845 2 1000001101 525 −2 14 1100001111 783 2 1000001110 526 −2 15 1000001111 527 0 16 1110011011 923 4 1010011000 664 −2 17 1101110101 885 4 1100010001 785 −2 18 1001011011 603 2 1100010010 786 −2 19 1110010011 915 2 1000010011 531 −2 20 1001010111 599 2 1100010100 788 −2 21 1110010101 917 2 1000010101 533 −2 22 1100010111 791 2 1000010110 534 −2 23 1000010111 535 0 24 1010011011 667 2 1100011000 792 −2 25 1100011101 797 2 1000010001 529 −4 26 1001011110 606 2 1000010010 530 −4 27 1000011011 539 0 28 1010011110 670 2 1000010100 532 −4 29 1000011101 541 0 30 1000011110 542 0 31 1100011110 798 2 1000011001 537 −2 32 1011110011 755 4 1001100100 612 −2 33 1110110101 949 4 1100100001 801 −2 34 1011111010 762 4 1100100010 802 −2 35 1010110011 691 2 1000100011 547 −2 36 1101110110 886 4 1100100100 804 −2 37 1010110101 693 2 1000100101 549 −2 38 1100100111 807 2 1000100110 550 −2 39 1000100111 551 0 40 1010101011 683 2 1100101000 808 −2 41 1100101101 813 2 1000001001 521 −4 42 1100101011 811 2 1000101010 554 −2 43 1000101011 555 0 44 1100101110 814 2 1000001100 524 −4 45 1000101101 557 0 46 1000101110 558 0 47 1000101111 559 2 1000101100 556 −2 48 1011111100 764 4 1010110000 688 −2 49 1100111001 825 2 1000100001 545 −4 50 1100110011 819 2 1000100010 546 −4 51 1000110011 563 0 1000110011 563 0 52 1100110101 821 2 1000100100 548 −4 53 1000110101 565 0 54 1000110110 566 0 55 1000110111 567 2 1000110100 564 −2 56 1100111010 826 2 1000011000 536 −4 57 1000111001 569 0 58 1000111010 570 0 59 1000111011 571 2 1000111000 568 −2 60 1000111100 572 0 61 1000111101 573 2 1000101001 553 −2 62 1000111110 574 2 1000110000 560 −4 63 1100111110 830 4 1000011100 540 −2 64 1001111101 637 4 1001101000 616 −2 65 1101111001 889 4 1101000001 833 −2 66 1001101011 619 2 1101000010 834 −2 67 1101010011 851 2 1001000011 579 −2 68 1001100111 615 2 1101000100 836 −2 69 1101100101 869 2 1001000101 581 −2 70 1101000111 839 2 1001000110 582 −2 71 1001000111 583 0 72 1001101101 621 2 0100000111 263 −2 73 1001111001 633 2 0001001001 73 −4 74 1001101110 622 2 0001001010 74 −4 75 1001001011 587 0 76 1101001110 846 2 0001001100 76 −4 77 1001001101 589 0 78 1001001110 590 0 79 0001001111 79 0 80 1001110011 627 2 1011010000 720 −2 81 1101011001 857 2 0001010001 81 −4 82 1101011010 858 2 0001010010 82 −4 83 1001010011 595 0 84 1101010110 854 2 0001010100 84 −4 85 1001010101 597 0 86 1001010110 598 0 87 0001010111 87 0 88 1101011100 860 2 0001011000 88 −4 89 1001011001 601 0 90 1001011010 602 0 91 0001011011 91 0 92 1001011100 604 0 93 0001011101 93 0 94 0001011110 94 0 95 1001011101 605 2 0001010011 83 −2 96 1001110101 629 2 0001000111 71 −2 97 1101101001 873 2 0001100001 97 −4 98 1001111010 634 2 0001100010 98 −4 99 1001100011 611 0 100 1001110110 630 2 0001100100 100 −4 101 1001100101 613 0 102 1001100110 614 0 103 0001100111 103 0 104 1101101010 874 2 1001001000 584 −4 105 1001101001 617 0 106 1001101010 618 0 107 0001101011 107 0 108 1001101100 620 0 109 0001101101 109 0 110 0001101110 110 0 111 0001101111 111 2 0001101100 108 −2 112 1001111100 636 2 0001101000 104 −4 113 1001110001 625 0 114 1001110010 626 0 115 0001110011 115 0 116 1001110100 628 0 117 0001110101 117 0 118 0001110110 118 0 119 0001110111 119 2 0001110100 116 −2 120 1001111000 632 0 121 0001111001 121 0 122 0001111010 122 0 123 0001111011 123 2 0001111000 120 −2 124 0001111100 124 0 125 0001111101 125 2 0001100011 99 −2 126 0001111110 126 2 0001101001 105 −2 127 1001111110 638 4 0001010110 86 −2 128 1011011101 733 4 1010101000 680 −2 129 1011111001 761 4 1011000001 705 −2 130 1011001011 715 2 1011000010 706 −2 131 1011100011 739 2 1010000011 643 −2 132 1010010111 663 2 1011000100 708 −2 133 1011100101 741 2 1010000101 645 −2 134 1011000111 711 2 1010000110 646 −2 135 1010000111 647 0 136 1011001101 717 2 1000000111 519 −2 137 1010111001 697 2 0010001001 137 −4 138 1010101110 686 2 0010001010 138 −4 139 1010001011 651 0 140 1011001110 718 2 0010001100 140 −4 141 1010001101 653 0 142 1010001110 654 0 143 0010001111 143 0 144 1011010011 723 2 1000001011 523 −2 145 1011011001 729 2 0010010001 145 −4 146 1011011010 730 2 0010010010 146 −4 147 1010010011 659 0 148 1011010110 726 2 0010010100 148 −4 149 1010010101 661 0 150 1010010110 662 0 151 0010010111 151 0 152 1011011100 732 2 0010011000 152 −4 153 1010011001 665 0 154 1010011010 666 0 155 0010011011 155 0 156 1010011100 668 0 157 0010011101 157 0 158 0010011110 158 0 159 1010011101 669 2 0010001011 139 −2 160 1010101101 685 2 0010000111 135 −2 161 1011101001 745 2 0010100001 161 −4 162 1010111010 698 2 0010100010 162 −4 163 1010100011 675 0 164 1010110110 694 2 0010100100 164 −4 165 1010100101 677 0 166 1010100110 678 0 167 0010100111 167 0 168 1011101010 746 2 1010001000 648 −4 169 1010101001 681 0 170 1010101010 682 0 171 0010101011 171 0 172 1010101100 684 0 173 0010101101 173 0 174 0010101110 174 0 175 0010101111 175 2 0010101100 172 −2 176 1010111100 700 2 0010101000 168 −4 177 1010110001 689 0 178 1010110010 690 0 179 0010110011 179 0 180 1010110100 692 0 181 0010110101 181 0 182 0010110110 182 0 183 0010110111 183 2 0010110100 180 −2 184 1010111000 696 0 185 0010111001 185 0 186 0010111010 186 0 187 0010111011 187 2 0010111000 184 −2 188 0010111100 188 0 189 0010111101 189 2 0010100011 163 −2 190 0010111110 190 2 0010100101 165 −2 191 1010111101 701 4 0010110001 177 −2 192 1011010101 725 2 0001001011 75 −2 193 1011110001 753 2 0011000001 193 −4 194 1011110010 754 2 0011000010 194 −4 195 1011000011 707 0 196 1011100110 742 2 0011000100 196 −4 197 1011000101 709 0 198 1011000110 710 0 199 0011000111 199 0 200 1011101100 748 2 0011001000 200 −4 201 1011001001 713 0 202 1011001010 714 0 203 0011001011 203 0 204 1011001100 716 0 205 0011001101 205 0 206 0011001110 206 0 207 0011001111 207 2 0011001100 204 −2 208 1011110100 756 2 1010010000 656 −4 209 1011010001 721 0 210 1011010010 722 0 211 0011010011 211 0 212 1011010100 724 0 213 0011010101 213 0 214 0011010110 214 0 215 0011010111 215 2 0011010100 212 −2 216 1011011000 728 0 217 0011011001 217 0 218 0011011010 218 0 219 0011011011 219 2 0011011000 216 −2 220 0011011100 220 0 221 0011011101 221 2 0011000011 195 −2 222 0011011110 222 2 0010011001 153 −2 223 1011011110 734 4 0010010110 150 −2 224 1011111000 760 2 0010110000 176 −4 225 1011100001 737 0 226 1011100010 738 0 227 0011100011 227 0 228 1011100100 740 0 229 0011100101 229 0 230 0011100110 230 0 231 0011100111 231 2 0011100100 228 −2 232 1011101000 744 0 233 0011101001 233 0 234 0011101010 234 0 235 0011101011 235 2 0011101000 232 −2 236 0011101100 236 0 237 0011101101 237 2 0001010101 85 −2 238 0011101110 238 2 0010101001 169 −2 239 1011101101 749 4 1011001000 712 −2 240 1011110000 752 0 241 0011110001 241 0 242 0011110010 242 0 243 0011110011 243 2 0011100010 226 −2 244 0011110100 244 0 245 0011110101 245 2 0010010101 149 −2 246 0011110110 246 2 0011000101 197 −2 247 0011110111 247 4 0010100110 166 −2 248 0011111000 248 0 249 0011111001 249 2 1001000001 577 −4 250 0011111010 250 2 1000001010 522 −4 251 0011111011 251 4 0010101010 170 −2 252 0011111100 252 2 0011001001 201 −2 253 0011111101 253 4 0011100001 225 −2 254 1011101110 750 4 0010110010 178 −2 255 1011010111 727 4 1010010001 657 −2 256 1101110011 883 4 1001110000 624 −2 257 1110111001 953 4 1110000001 897 −2 258 1110101110 942 4 1110000010 898 −2 259 1101100011 867 2 1100000011 771 −2 260 1110110110 950 4 1110000100 900 −2 261 1110100101 933 2 1100000101 773 −2 262 1110000111 903 2 1100000110 774 −2 263 1100000111 775 0 264 1101111010 890 4 1110001000 904 −2 265 1110001101 909 2 0100001001 265 −4 266 1110001011 907 2 1100001010 778 −2 267 1100001011 779 0 268 1110001110 910 2 0100001100 268 −4 269 1100001101 781 0 270 1100001110 782 0 271 0100001111 271 0 272 1110111010 954 4 1101010000 848 −2 273 1110011001 921 2 0100010001 273 −4 274 1110011010 922 2 0100010010 274 −4 275 1100010011 787 0 276 1110010110 918 2 0100010100 276 −4 277 1100010101 789 0 278 1100010110 790 0 279 0100010111 279 0 280 1110011100 924 2 0100011000 280 −4 281 1100011001 793 0 282 1100011010 794 0 283 0100011011 283 0 284 1100011100 796 0 285 0100011101 285 0 286 0100011110 286 0 287 1100011011 795 2 0100011100 284 −2 288 1101111100 892 4 1100110000 816 −2 289 1110101001 937 2 0100100001 289 −4 290 1110100011 931 2 0100100010 290 −4 291 1100100011 803 0 292 1100110110 822 2 0100100100 292 −4 293 1100100101 805 0 294 1100100110 806 0 295 0100100111 295 0 296 1110101010 938 2 1000101000 552 −4 297 1100101001 809 0 298 1100101010 810 0 299 0100101011 299 0 300 1100101100 812 0 301 0100101101 301 0 302 0100101110 302 0 303 0100101111 303 2 0100101100 300 −2 304 1100111100 828 2 0100101000 296 −4 305 1100110001 817 0 306 1100110010 818 0 307 0100110011 307 0 308 1100110100 820 0 309 0100110101 309 0 310 0100110110 310 0 311 0100110111 311 2 0100110100 308 −2 312 1100111000 824 0 313 0100111001 313 0 314 0100111010 314 0 315 0100111011 315 2 0100111000 312 −2 316 0100111100 316 0 317 0100111101 317 2 0100100011 291 −2 318 0100111110 318 2 0100100101 293 −2 319 1100111101 829 4 1000110010 562 −2 320 1101010101 853 2 0100001011 267 −2 321 1101110001 881 2 0101000001 321 −4 322 1101110010 882 2 0101000010 322 −4 323 1101000011 835 0 324 1101100110 870 2 0101000100 324 −4 325 1101000101 837 0 326 1101000110 838 0 327 0101000111 327 0 328 1101101100 876 2 0101001000 328 −4 329 1101001001 841 0 330 1101001010 842 0 331 0101001011 331 0 332 1101001100 844 0 333 0101001101 333 0 334 0101001110 334 0 335 0101001111 335 2 0101001100 332 −2 336 1101110100 884 2 1001010000 592 −4 337 1101010001 849 0 338 1101010010 850 0 339 0101010011 339 0 340 1101010100 852 0 341 0101010101 341 0 342 0101010110 342 0 343 0101010111 343 2 0101010100 340 −2 344 1101011000 856 0 345 0101011001 345 0 346 0101011010 346 0 347 0101011011 347 2 0101011000 344 −2 348 0101011100 348 0 349 0101011101 349 2 0101000011 323 −2 350 0101011110 350 2 0001011001 89 −2 351 1101011101 861 4 0001011010 90 −2 352 1101111000 888 2 0001110000 112 −4 353 1101100001 865 0 354 1101100010 866 0 355 0101100011 355 0 356 1101100100 868 0 357 0101100101 357 0 358 0101100110 358 0 359 0101100111 359 2 0101100100 356 −2 360 1101101000 872 0 361 0101101001 361 0 362 0101101010 362 0 363 0101101011 363 2 0101101000 360 −2 364 0101101100 364 0 365 0101101101 365 2 0001001101 77 −2 366 0101101110 366 2 0101001001 329 −2 367 1101101011 875 4 0001001110 78 −2 368 1101110000 880 0 369 0101110001 369 0 370 0101110010 370 0 371 0101110011 371 2 0101100010 354 −2 372 0101110100 372 0 373 0101110101 373 2 0001100101 101 −2 374 0101110110 374 2 0001000110 70 −4 375 0101110111 375 4 0001100110 102 −2 376 0101111000 376 0 377 0101111001 377 2 1001001001 585 −2 378 0101111010 378 2 1001000010 578 −4 379 0101111011 379 4 0001101010 106 −2 380 0101111100 380 2 1001000100 580 −4 381 0101111101 381 4 0101010001 337 −2 382 1101011110 862 4 0001110010 114 −2 383 1101010111 855 4 1001100001 609 −2 384 1110111100 956 4 1110010000 912 −2 385 1110110001 945 2 1100000001 769 −4 386 1110110010 946 2 1100000010 770 −4 387 1110000011 899 0 388 1110100110 934 2 1100000100 772 −4 389 1110000101 901 0 390 1110000110 902 0 391 0110000111 391 0 392 1110101100 940 2 1100001000 776 −4 393 1110001001 905 0 394 1110001010 906 0 395 0110001011 395 0 396 1110001100 908 0 397 0110001101 397 0 398 0110001110 398 0 399 0110001111 399 2 0110001100 396 −2 400 1110110100 948 2 1100010000 784 −4 401 1110010001 913 0 402 1110010010 914 0 403 0110010011 403 0 404 1110010100 916 0 405 0110010101 405 0 406 0110010110 406 0 407 0110010111 407 2 0110010100 404 −2 408 1110011000 920 0 409 0110011001 409 0 410 0110011010 410 0 411 0110011011 411 2 0110010010 402 −2 412 0110011100 412 0 413 0110011101 413 2 0110000011 387 −2 414 0110011110 414 2 0100011001 281 −2 415 1110011101 925 4 0010011010 154 −2 416 1110111000 952 2 0100110000 304 −4 417 1110100001 929 0 418 1110100010 930 0 419 0110100011 419 0 420 1110100100 932 0 421 0110100101 421 0 422 0110100110 422 0 423 0110100111 423 2 0110100100 420 −2 424 1110101000 936 0 425 0110101001 425 0 426 0110101010 426 0 427 0110101011 427 2 0110001010 394 −2 428 0110101100 428 0 429 0110101101 429 2 0010001101 141 −2 430 0110101110 430 2 0100101001 297 −2 431 1110100111 935 4 0010001110 142 −2 432 1110110000 944 0 433 0110110001 433 0 434 0110110010 434 0 435 0110110011 435 2 0110100010 418 −2 436 0110110100 436 0 437 0110110101 437 2 0100010101 277 −2 438 0110110110 438 2 1000000110 518 −4 439 0110110111 439 4 0100100110 294 −2 440 0110111000 440 0 441 0110111001 441 2 1010000001 641 −4 442 0110111010 442 2 1010000010 642 −4 443 0110111011 443 4 0100101010 298 −2 444 0110111100 444 2 1010000100 644 −4 445 0110111101 445 4 0100110001 305 −2 446 1010111110 702 4 0100110010 306 −2 447 1100110111 823 4 1000011010 538 −2 448 0111101010 490 2 0011010000 208 −4 449 0111110001 497 2 0110000001 385 −4 450 0111110010 498 2 0110000010 386 −4 451 0111000011 451 0 452 0111011100 476 2 0110000100 388 −4 453 0111000101 453 0 454 0111000110 454 0 455 0111000111 455 2 0111000100 452 −2 456 0111101100 492 2 0110001000 392 −4 457 0111001001 457 0 458 0111001010 458 0 459 0111001011 459 2 0111000010 450 −2 460 0111001100 460 0 461 0111001101 461 2 0100001101 269 −2 462 0111001110 462 2 0110001001 393 −2 463 1110001111 911 4 0100001110 270 −2 464 0111110100 500 2 0101010000 336 −4 465 0111010001 465 0 466 0111010010 466 0 467 0111010011 467 2 0010010011 147 −2 468 0111010100 468 0 469 0111010101 469 2 0101000101 325 −2 470 0111010110 470 2 0010000110 134 −4 471 0111010111 471 4 0100010110 278 −2 472 0111011000 472 0 473 0111011001 473 2 1010001001 649 −2 474 0111011010 474 2 0100001010 266 −4 475 0111011011 475 4 0100011010 282 −2 476 0111011110 478 4 0110011000 408 −2 477 0111011101 477 4 0110010001 401 −2 478 1110011110 926 4 0001011100 92 −2 479 1110010111 919 4 1001001100 588 −2 480 0111111000 504 2 0110010000 400 −4 481 0111100001 481 0 482 0111100010 482 0 483 0111100011 483 2 0100010011 275 −2 484 0111100100 484 0 485 0111100101 485 2 0110000101 389 −2 486 0111100110 486 2 0100000110 262 −4 487 0111100111 487 4 0011000110 198 −2 488 0111101000 488 0 489 0111101001 489 2 1100001001 777 −2 490 0111101011 491 4 0110101000 424 −2 491 1110101011 939 4 0011001010 202 −2 492 0111101110 494 4 0111001000 456 −2 493 1101101101 877 4 0101100001 353 −2 494 1101101110 878 4 0101001010 330 −2 495 1101001111 847 4 1010001100 652 −2 496 0111110000 496 0 497 0111111001 505 4 0011110000 240 −2 498 0111111010 506 4 0101110000 368 −2 499 0111110011 499 4 0011010001 209 −2 500 0111110110 502 4 0110110000 432 −2 501 0111101101 493 4 0110100001 417 −2 502 0011111110 254 4 0011010010 210 −2 503 1011100111 743 4 1001010010 594 −2 504 0111111100 508 4 0111010000 464 −2 505 0111110101 501 4 0111000001 449 −2 506 0101111110 382 4 0101010010 338 −2 507 1001111011 635 4 1010010010 658 −2 508 0110111110 446 4 0010011100 156 −2 509 1010111011 699 4 0001110001 113 −2 510 1011011011 731 4 1001010100 596 −2 511 1001110111 631 4 1000110001 561 −2

The line coding provided herein is applicable to the traditional coding and decoding methods based on table search. Further, a line coding method is provided in an embodiment of the present invention.

The line coding method in this embodiment performs coding by searching the code table generated in the foregoing embodiment. The method includes:

performing 9B10B line coding for every 9-bit source data according to a current operation difference value of line coding, where the line coding is implemented by searching a code table, and the code table is shown in Table 2;

calculating the coded operation difference value; and

judging whether the coded operation difference value is greater than a preset value, and if the coded operation difference value is greater than the preset value, using the 10-bit sequence obtained through complementing the 10-bit codeword as the coding result corresponding to the 9-bit source data, where a judgment needs to be made about whether the operation difference value exceeds the maximum allowed amplitude.

As shown in FIG. 3, a convolutional line coder is provided in an embodiment of the present invention. The coder 50 includes:

a sequence set obtaining module 501, configured to construct a sequence set, where the length of each sequence is n bits;

a relation associating module 502, configured to: select a balanced sequence in the sequence set, and obtain source data of n−1 bits corresponding to the balanced sequence; perform Hamming distance detection for the unbalanced sequence in the sequence set to obtain source data of n−1 bits corresponding to the unbalanced sequence; sort the balanced sequence and the unbalanced sequence according to an operation difference value, and generate a code table, where the source data of n−1 bits correspond to the sequence of n bits, and the code table is designed for line coding; and at time of encoding the source data of n−1 bits, obtain a coding result of n bits according to a mapping relation in the code table, where the relation associating module obtains the source data of n−1 bits corresponding to the balanced sequence by deleting the first bit or the last bit; and

a coding module 503, configured to: sort the balanced sequence and the unbalanced sequence according to the operation difference value, and generate a code table, where the source data of n−1 bits corresponds to the sequence of n bits; at the time of encoding the source data of n−1 bits, obtain the coding result of n bits according to the mapping relation in the code table.

The coding module 503 is further configured to calculate the coded operation difference value.

The coder 50 further includes a complementing module 504, configured to use the n−bit sequence obtained through complementing the n−bit codeword as the coding result corresponding to the source data of n−1 bits if the coded operation difference value is greater than a preset value. The coder 50 may further include a comparing module, which is configured to check whether the coded operation difference value is greater than a preset value. The comparing module may be independent of or combined with the coding module 503 or complementing module 504.

Persons of ordinary skill in the art may understand that all or a part of the steps of the method according to the embodiments of the present invention may be implemented by a program instructing relevant hardware. The program may be stored in a computer readable storage medium, such as a Read-Only Memory (ROM), a Random Access Memory (RAM) a magnetic disk or a Compact Disk Read-Only Memory (CD-ROM).

The above descriptions are merely some exemplary embodiments of the present invention, but not intended to limit the scope of the present invention. Any modifications, variations or replacement that can be easily derived by those skilled in the art should fall within the scope of the present invention. Therefore, the protection scope of the present invention is subject to the appended claims. 

1. A convolutional line coding method, comprising: constructing a sequence set, wherein a length of each sequence in the sequence set is n bits, and n is a natural number greater than 1; selecting a balanced sequence in the sequence set, and obtaining source data of n−1 bits corresponding to the balanced sequence; performing Hamming distance detection for an unbalanced sequence in the sequence set to obtain source data of n−1 bits corresponding to the unbalanced sequence; and sorting the balanced sequence and the unbalanced sequence according to an operation difference value, and generating a code table, wherein the source data of n−1 bits corresponds to the sequence of n bits, and the code table is designed for line coding; and at time of encoding the source data of n−1 bits, obtaining a coding result of n bits according to a mapping relation in the code table.
 2. The method of claim 1, wherein the selecting a balanced sequence in the sequence set, and obtaining of the source data of n−1 bits corresponding to the balanced sequence comprises: deleting a first bit or a last bit in the balanced sequence to obtain the source data of n−1 bits corresponding to the balanced sequence.
 3. The method of claim 1, wherein if n=10, the sequence set comprises: a 10-bit balanced sequence, a sequence composed of six is and four 0s, a sequence composed of six 0s and four is, a sequence composed of seven 1s and three 0s, and a sequence composed of seven 0s and three 1s.
 4. The method of claim 3, wherein: 512 sequences in the sequence set are selected as 10-bit sequences according to the number of continuous 0s or continuous is in the sequences, and the 10-bit sequences make up a sequence set.
 5. The method of claim 3, wherein: for the balanced sequence, a first bit or a last bit of each 10-bit sequence is deleted to obtain 9 bits, which are 9-bit source data corresponding to a 10-bit codeword; and for the unbalanced sequence, a Hamming distance between the 9-bit source data and the 10-bit sequence is detected, and the 10-bit sequence corresponding to the 9-bit source data is obtained when the Hamming distance reaches a minimum value.
 6. The method of claim 5, wherein: the sequences are sorted according to the operation difference values to generate a 9B10B code table corresponding to each operation difference value, wherein the operation difference values include −4, −2, 0, 2, and 4; the code table whose operation difference value is 0 is composed of 240 DC-balance 10-bit codewords; the code table whose operation difference value is ±2 is composed of 190 10-bit codewords, and each codeword comprises six 1s and four 0s, or comprises six 0s and four 1s; the code table whose operation difference value is ±4 is composed of 82 10-bit codewords, and each codeword comprises seven 1s and three 0s, or comprises seven 0s and three 1s.
 7. A convolutional line coder, comprising: a sequence set obtaining module, configured to construct a sequence set, wherein a length of each sequence is n bits; a relation associating module, configured to select a balanced sequence in the sequence set, and obtain source data of n−1 bits corresponding to the balanced sequence; perform Hamming distance detection for an unbalanced sequence in the sequence set to obtain source data of n−1 bits corresponding to the unbalanced sequence; and a coding module, configured to sort the balanced sequence and the unbalanced sequence according to an operation difference value, and generating the code table, wherein the source data of n−1 bits corresponds to the sequence of n bits; and at the time of encoding the source data of n−1 bits, obtain the coding result of n bits according to the mapping relation in the code table.
 8. The coder of claim 7, wherein: the relation associating module obtains the source data of n−1 bits corresponding to the balanced sequence by deleting a first bit or a last bit.
 9. The coder of claim 7, further comprising: a complementing module, configured to use the n−bit sequence obtained through complementing an n−bit codeword as a coding result corresponding to the source data of n−1 bits if coded operation difference value is greater than a preset value.
 10. A coding method, comprising: performing 9B10B line coding for every 9-bit source data according to a current operation difference value of line coding, wherein a code table is searched for 10-bit sequences, and the line coding is implemented according to the following code table: Code table Operation 9B 10B difference 10B Operation (decimal) Binary Decimal value Binary Decimal difference value 0 1010110111 695 4 1001010001 593 −2 1 1100111011 827 4 1010100001 673 −2 2 1101011011 859 4 1001100010 610 −2 3 1110110011 947 4 1010100010 674 −2 4 1101100111 871 4 1010010100 660 −2 5 1011110101 757 4 1010100100 676 −2 6 1011110110 758 4 0101000110 326 −2 7 1010100111 679 2 0110000110 390 −2 8 1011101011 747 4 1001011000 600 −2 9 1110101101 941 4 1101001000 840 −2 10 1001001111 591 2 1001001010 586 −2 11 1101001011 843 2 1010001010 650 −2 12 1010001111 655 2 1100001100 780 −2 13 1101001101 845 2 1000001101 525 −2 14 1100001111 783 2 1000001110 526 −2 15 1000001111 527 0 16 1110011011 923 4 1010011000 664 −2 17 1101110101 885 4 1100010001 785 −2 18 1001011011 603 2 1100010010 786 −2 19 1110010011 915 2 1000010011 531 −2 20 1001010111 599 2 1100010100 788 −2 21 1110010101 917 2 1000010101 533 −2 22 1100010111 791 2 1000010110 534 −2 23 1000010111 535 0 24 1010011011 667 2 1100011000 792 −2 25 1100011101 797 2 1000010001 529 −4 26 1001011110 606 2 1000010010 530 −4 27 1000011011 539 0 28 1010011110 670 2 1000010100 532 −4 29 1000011101 541 0 30 1000011110 542 0 31 1100011110 798 2 1000011001 537 −2 32 1011110011 755 4 1001100100 612 −2 33 1110110101 949 4 1100100001 801 −2 34 1011111010 762 4 1100100010 802 −2 35 1010110011 691 2 1000100011 547 −2 36 1101110110 886 4 1100100100 804 −2 37 1010110101 693 2 1000100101 549 −2 38 1100100111 807 2 1000100110 550 −2 39 1000100111 551 0 40 1010101011 683 2 1100101000 808 −2 41 1100101101 813 2 1000001001 521 −4 42 1100101011 811 2 1000101010 554 −2 43 1000101011 555 0 44 1100101110 814 2 1000001100 524 −4 45 1000101101 557 0 46 1000101110 558 0 47 1000101111 559 2 1000101100 556 −2 48 1011111100 764 4 1010110000 688 −2 49 1100111001 825 2 1000100001 545 −4 50 1100110011 819 2 1000100010 546 −4 51 1000110011 563 0 1000110011 563 0 52 1100110101 821 2 1000100100 548 −4 53 1000110101 565 0 54 1000110110 566 0 55 1000110111 567 2 1000110100 564 −2 56 1100111010 826 2 1000011000 536 −4 57 1000111001 569 0 58 1000111010 570 0 59 1000111011 571 2 1000111000 568 −2 60 1000111100 572 0 61 1000111101 573 2 1000101001 553 −2 62 1000111110 574 2 1000110000 560 −4 63 1100111110 830 4 1000011100 540 −2 64 1001111101 637 4 1001101000 616 −2 65 1101111001 889 4 1101000001 833 −2 66 1001101011 619 2 1101000010 834 −2 67 1101010011 851 2 1001000011 579 −2 68 1001100111 615 2 1101000100 836 −2 69 1101100101 869 2 1001000101 581 −2 70 1101000111 839 2 1001000110 582 −2 71 1001000111 583 0 72 1001101101 621 2 0100000111 263 −2 73 1001111001 633 2 0001001001 73 −4 74 1001101110 622 2 0001001010 74 −4 75 1001001011 587 0 76 1101001110 846 2 0001001100 76 −4 77 1001001101 589 0 78 1001001110 590 0 79 0001001111 79 0 80 1001110011 627 2 1011010000 720 −2 81 1101011001 857 2 0001010001 81 −4 82 1101011010 858 2 0001010010 82 −4 83 1001010011 595 0 84 1101010110 854 2 0001010100 84 −4 85 1001010101 597 0 86 1001010110 598 0 87 0001010111 87 0 88 1101011100 860 2 0001011000 88 −4 89 1001011001 601 0 90 1001011010 602 0 91 0001011011 91 0 92 1001011100 604 0 93 0001011101 93 0 94 0001011110 94 0 95 1001011101 605 2 0001010011 83 −2 96 1001110101 629 2 0001000111 71 −2 97 1101101001 873 2 0001100001 97 −4 98 1001111010 634 2 0001100010 98 −4 99 1001100011 611 0 100 1001110110 630 2 0001100100 100 −4 101 1001100101 613 0 102 1001100110 614 0 103 0001100111 103 0 104 1101101010 874 2 1001001000 584 −4 105 1001101001 617 0 106 1001101010 618 0 107 0001101011 107 0 108 1001101100 620 0 109 0001101101 109 0 110 0001101110 110 0 111 0001101111 111 2 0001101100 108 −2 112 1001111100 636 2 0001101000 104 −4 113 1001110001 625 0 114 1001110010 626 0 115 0001110011 115 0 116 1001110100 628 0 117 0001110101 117 0 118 0001110110 118 0 119 0001110111 119 2 0001110100 116 −2 120 1001111000 632 0 121 0001111001 121 0 122 0001111010 122 0 123 0001111011 123 2 0001111000 120 −2 124 0001111100 124 0 125 0001111101 125 2 0001100011 99 −2 126 0001111110 126 2 0001101001 105 −2 127 1001111110 638 4 0001010110 86 −2 128 1011011101 733 4 1010101000 680 −2 129 1011111001 761 4 1011000001 705 −2 130 1011001011 715 2 1011000010 706 −2 131 1011100011 739 2 1010000011 643 −2 132 1010010111 663 2 1011000100 708 −2 133 1011100101 741 2 1010000101 645 −2 134 1011000111 711 2 1010000110 646 −2 135 1010000111 647 0 136 1011001101 717 2 1000000111 519 −2 137 1010111001 697 2 0010001001 137 −4 138 1010101110 686 2 0010001010 138 −4 139 1010001011 651 0 140 1011001110 718 2 0010001100 140 −4 141 1010001101 653 0 142 1010001110 654 0 143 0010001111 143 0 144 1011010011 723 2 1000001011 523 −2 145 1011011001 729 2 0010010001 145 −4 146 1011011010 730 2 0010010010 146 −4 147 1010010011 659 0 148 1011010110 726 2 0010010100 148 −4 149 1010010101 661 0 150 1010010110 662 0 151 0010010111 151 0 152 1011011100 732 2 0010011000 152 −4 153 1010011001 665 0 154 1010011010 666 0 155 0010011011 155 0 156 1010011100 668 0 157 0010011101 157 0 158 0010011110 158 0 159 1010011101 669 2 0010001011 139 −2 160 1010101101 685 2 0010000111 135 −2 161 1011101001 745 2 0010100001 161 −4 162 1010111010 698 2 0010100010 162 −4 163 1010100011 675 0 164 1010110110 694 2 0010100100 164 −4 165 1010100101 677 0 166 1010100110 678 0 167 0010100111 167 0 168 1011101010 746 2 1010001000 648 −4 169 1010101001 681 0 170 1010101010 682 0 171 0010101011 171 0 172 1010101100 684 0 173 0010101101 173 0 174 0010101110 174 0 175 0010101111 175 2 0010101100 172 −2 176 1010111100 700 2 0010101000 168 −4 177 1010110001 689 0 178 1010110010 690 0 179 0010110011 179 0 180 1010110100 692 0 181 0010110101 181 0 182 0010110110 182 0 183 0010110111 183 2 0010110100 180 −2 184 1010111000 696 0 185 0010111001 185 0 186 0010111010 186 0 187 0010111011 187 2 0010111000 184 −2 188 0010111100 188 0 189 0010111101 189 2 0010100011 163 −2 190 0010111110 190 2 0010100101 165 −2 191 1010111101 701 4 0010110001 177 −2 192 1011010101 725 2 0001001011 75 −2 193 1011110001 753 2 0011000001 193 −4 194 1011110010 754 2 0011000010 194 −4 195 1011000011 707 0 196 1011100110 742 2 0011000100 196 −4 197 1011000101 709 0 198 1011000110 710 0 199 0011000111 199 0 200 1011101100 748 2 0011001000 200 −4 201 1011001001 713 0 202 1011001010 714 0 203 0011001011 203 0 204 1011001100 716 0 205 0011001101 205 0 206 0011001110 206 0 207 0011001111 207 2 0011001100 204 −2 208 1011110100 756 2 1010010000 656 −4 209 1011010001 721 0 210 1011010010 722 0 211 0011010011 211 0 212 1011010100 724 0 213 0011010101 213 0 214 0011010110 214 0 215 0011010111 215 2 0011010100 212 −2 216 1011011000 728 0 217 0011011001 217 0 218 0011011010 218 0 219 0011011011 219 2 0011011000 216 −2 220 0011011100 220 0 221 0011011101 221 2 0011000011 195 −2 222 0011011110 222 2 0010011001 153 −2 223 1011011110 734 4 0010010110 150 −2 224 1011111000 760 2 0010110000 176 −4 225 1011100001 737 0 226 1011100010 738 0 227 0011100011 227 0 228 1011100100 740 0 229 0011100101 229 0 230 0011100110 230 0 231 0011100111 231 2 0011100100 228 −2 232 1011101000 744 0 233 0011101001 233 0 234 0011101010 234 0 235 0011101011 235 2 0011101000 232 −2 236 0011101100 236 0 237 0011101101 237 2 0001010101 85 −2 238 0011101110 238 2 0010101001 169 −2 239 1011101101 749 4 1011001000 712 −2 240 1011110000 752 0 241 0011110001 241 0 242 0011110010 242 0 243 0011110011 243 2 0011100010 226 −2 244 0011110100 244 0 245 0011110101 245 2 0010010101 149 −2 246 0011110110 246 2 0011000101 197 −2 247 0011110111 247 4 0010100110 166 −2 248 0011111000 248 0 249 0011111001 249 2 1001000001 577 −4 250 0011111010 250 2 1000001010 522 −4 251 0011111011 251 4 0010101010 170 −2 252 0011111100 252 2 0011001001 201 −2 253 0011111101 253 4 0011100001 225 −2 254 1011101110 750 4 0010110010 178 −2 255 1011010111 727 4 1010010001 657 −2 256 1101110011 883 4 1001110000 624 −2 257 1110111001 953 4 1110000001 897 −2 258 1110101110 942 4 1110000010 898 −2 259 1101100011 867 2 1100000011 771 −2 260 1110110110 950 4 1110000100 900 −2 261 1110100101 933 2 1100000101 773 −2 262 1110000111 903 2 1100000110 774 −2 263 1100000111 775 0 264 1101111010 890 4 1110001000 904 −2 265 1110001101 909 2 0100001001 265 −4 266 1110001011 907 2 1100001010 778 −2 267 1100001011 779 0 268 1110001110 910 2 0100001100 268 −4 269 1100001101 781 0 270 1100001110 782 0 271 0100001111 271 0 272 1110111010 954 4 1101010000 848 −2 273 1110011001 921 2 0100010001 273 −4 274 1110011010 922 2 0100010010 274 −4 275 1100010011 787 0 276 1110010110 918 2 0100010100 276 −4 277 1100010101 789 0 278 1100010110 790 0 279 0100010111 279 0 280 1110011100 924 2 0100011000 280 −4 281 1100011001 793 0 282 1100011010 794 0 283 0100011011 283 0 284 1100011100 796 0 285 0100011101 285 0 286 0100011110 286 0 287 1100011011 795 2 0100011100 284 −2 288 1101111100 892 4 1100110000 816 −2 289 1110101001 937 2 0100100001 289 −4 290 1110100011 931 2 0100100010 290 −4 291 1100100011 803 0 292 1100110110 822 2 0100100100 292 −4 293 1100100101 805 0 294 1100100110 806 0 295 0100100111 295 0 296 1110101010 938 2 1000101000 552 −4 297 1100101001 809 298 1100101010 810 0 299 0100101011 299 0 300 1100101100 812 0 301 0100101101 301 0 302 0100101110 302 0 303 0100101111 303 2 0100101100 300 −2 304 1100111100 828 2 0100101000 296 −4 305 1100110001 817 0 306 1100110010 818 0 307 0100110011 307 0 308 1100110100 820 0 309 0100110101 309 0 310 0100110110 310 0 311 0100110111 311 2 0100110100 308 −2 312 1100111000 824 0 313 0100111001 313 0 314 0100111010 314 0 315 0100111011 315 2 0100111000 312 −2 316 0100111100 316 0 317 0100111101 317 2 0100100011 291 −2 318 0100111110 318 2 0100100101 293 −2 319 1100111101 829 4 1000110010 562 −2 320 1101010101 853 2 0100001011 267 −2 321 1101110001 881 2 0101000001 321 −4 322 1101110010 882 2 0101000010 322 −4 323 1101000011 835 0 324 1101100110 870 2 0101000100 324 −4 325 1101000101 837 0 326 1101000110 838 0 327 0101000111 327 0 328 1101101100 876 2 0101001000 328 −4 329 1101001001 841 0 330 1101001010 842 0 331 0101001011 331 0 332 1101001100 844 0 333 0101001101 333 0 334 0101001110 334 0 335 0101001111 335 2 0101001100 332 −2 336 1101110100 884 2 1001010000 592 −4 337 1101010001 849 0 338 1101010010 850 0 339 0101010011 339 0 340 1101010100 852 0 341 0101010101 341 0 342 0101010110 342 0 343 0101010111 343 2 0101010100 340 −2 344 1101011000 856 0 345 0101011001 345 0 346 0101011010 346 0 347 0101011011 347 2 0101011000 344 −2 348 0101011100 348 0 349 0101011101 349 2 0101000011 323 −2 350 0101011110 350 2 0001011001 89 −2 351 1101011101 861 4 0001011010 90 −2 352 1101111000 888 2 0001110000 112 −4 353 1101100001 865 0 354 1101100010 866 0 355 0101100011 355 0 356 1101100100 868 0 357 0101100101 357 0 358 0101100110 358 0 359 0101100111 359 2 0101100100 356 −2 360 1101101000 872 0 361 0101101001 361 0 362 0101101010 362 0 363 0101101011 363 2 0101101000 360 −2 364 0101101100 364 0 365 0101101101 365 2 0001001101 77 −2 366 0101101110 366 2 0101001001 329 −2 367 1101101011 875 4 0001001110 78 −2 368 1101110000 880 0 369 0101110001 369 0 370 0101110010 370 0 371 0101110011 371 2 0101100010 354 −2 372 0101110100 372 0 373 0101110101 373 2 0001100101 101 −2 374 0101110110 374 2 0001000110 70 −4 375 0101110111 375 4 0001100110 102 −2 376 0101111000 376 0 377 0101111001 377 2 1001001001 585 −2 378 0101111010 378 2 1001000010 578 −4 379 0101111011 379 4 0001101010 106 −2 380 0101111100 380 2 1001000100 580 −4 381 0101111101 381 4 0101010001 337 −2 382 1101011110 862 4 0001110010 114 −2 383 1101010111 855 4 1001100001 609 −2 384 1110111100 956 4 1110010000 912 −2 385 1110110001 945 2 1100000001 769 −4 386 1110110010 946 2 1100000010 770 −4 387 1110000011 899 0 388 1110100110 934 2 1100000100 772 −4 389 1110000101 901 0 390 1110000110 902 0 391 0110000111 391 0 392 1110101100 940 2 1100001000 776 −4 393 1110001001 905 0 394 1110001010 906 0 395 0110001011 395 0 396 1110001100 908 0 397 0110001101 397 0 398 0110001110 398 0 399 0110001111 399 2 0110001100 396 −2 400 1110110100 948 2 1100010000 784 −4 401 1110010001 913 0 402 1110010010 914 0 403 0110010011 403 0 404 1110010100 916 0 405 0110010101 405 0 406 0110010110 406 0 407 0110010111 407 2 0110010100 404 −2 408 1110011000 920 0 409 0110011001 409 0 410 0110011010 410 0 411 0110011011 411 2 0110010010 402 −2 412 0110011100 412 0 413 0110011101 413 2 0110000011 387 −2 414 0110011110 414 2 0100011001 281 −2 415 1110011101 925 4 0010011010 154 −2 416 1110111000 952 2 0100110000 304 −4 417 1110100001 929 0 418 1110100010 930 0 419 0110100011 419 0 420 1110100100 932 0 421 0110100101 421 0 422 0110100110 422 0 423 0110100111 423 2 0110100100 420 −2 424 1110101000 936 0 425 0110101001 425 0 426 0110101010 426 0 427 0110101011 427 2 0110001010 394 −2 428 0110101100 428 0 429 0110101101 429 2 0010001101 141 −2 430 0110101110 430 2 0100101001 297 −2 431 1110100111 935 4 0010001110 142 −2 432 1110110000 944 0 433 0110110001 433 0 434 0110110010 434 0 435 0110110011 435 2 0110100010 418 −2 436 0110110100 436 0 437 0110110101 437 2 0100010101 277 −2 438 0110110110 438 2 1000000110 518 −4 439 0110110111 439 4 0100100110 294 −2 440 0110111000 440 0 441 0110111001 441 2 1010000001 641 −4 442 0110111010 442 2 1010000010 642 −4 443 0110111011 443 4 0100101010 298 −2 444 0110111100 444 2 1010000100 644 −4 445 0110111101 445 4 0100110001 305 −2 446 1010111110 702 4 0100110010 306 −2 447 1100110111 823 4 1000011010 538 −2 448 0111101010 490 2 0011010000 208 −4 449 0111110001 497 2 0110000001 385 −4 450 0111110010 498 2 0110000010 386 −4 451 0111000011 451 0 452 0111011100 476 2 0110000100 388 −4 453 0111000101 453 0 454 0111000110 454 0 455 0111000111 455 2 0111000100 452 −2 456 0111101100 492 2 0110001000 392 −4 457 0111001001 457 0 458 0111001010 458 0 459 0111001011 459 2 0111000010 450 −2 460 0111001100 460 0 461 0111001101 461 2 0100001101 269 −2 462 0111001110 462 2 0110001001 393 −2 463 1110001111 911 4 0100001110 270 −2 464 0111110100 500 2 0101010000 336 −4 465 0111010001 465 0 466 0111010010 466 0 467 0111010011 467 2 0010010011 147 −2 468 0111010100 468 0 469 0111010101 469 2 0101000101 325 −2 470 0111010110 470 2 0010000110 134 −4 471 0111010111 471 4 0100010110 278 −2 472 0111011000 472 0 473 0111011001 473 2 1010001001 649 −2 474 0111011010 474 2 0100001010 266 −4 475 0111011011 475 4 0100011010 282 −2 476 0111011110 478 4 0110011000 408 −2 477 0111011101 477 4 0110010001 401 −2 478 1110011110 926 4 0001011100 92 −2 479 1110010111 919 4 1001001100 588 −2 480 0111111000 504 2 0110010000 400 −4 481 0111100001 481 0 482 0111100010 482 0 483 0111100011 483 2 0100010011 275 −2 484 0111100100 484 0 485 0111100101 485 2 0110000101 389 −2 486 0111100110 486 2 0100000110 262 −4 487 0111100111 487 4 0011000110 198 −2 488 0111101000 488 0 489 0111101001 489 2 1100001001 777 −2 490 0111101011 491 4 0110101000 424 −2 491 1110101011 939 4 0011001010 202 −2 492 0111101110 494 4 0111001000 456 −2 493 1101101101 877 4 0101100001 353 −2 494 1101101110 878 4 0101001010 330 −2 495 1101001111 847 4 1010001100 652 −2 496 0111110000 496 0 497 0111111001 505 4 0011110000 240 −2 498 0111111010 506 4 0101110000 368 −2 499 0111110011 499 4 0011010001 209 −2 500 0111110110 502 4 0110110000 432 −2 501 0111101101 493 4 0110100001 417 −2 502 0011111110 254 4 0011010010 210 −2 503 1011100111 743 4 1001010010 594 −2 504 0111111100 508 4 0111010000 464 −2 505 0111110101 501 4 0111000001 449 −2 506 0101111110 382 4 0101010010 338 −2 507 1001111011 635 4 1010010010 658 −2 508 0110111110 446 4 0010011100 156 −2 509 1010111011 699 4 0001110001 113 −2 510 1011011011 731 4 1001010100 596 −2 511 1001110111 631 4 1000110001 561 −2


11. The method of claim 10, further comprising: calculating a coded operation difference value.
 12. The method of claim 11, further comprising: judging whether the coded operation difference value is greater than a preset value, and if the coded operation difference value is greater than the preset value, using the 10-bit sequence obtained through complementing a 10-bit codeword as a coding result corresponding to the 9-bit source data. 